温度与食物对老年低额溞种群动态的影响

Effects of Food and Temperature on the Population Dynamics of Simocephalus vetuls

在三个温度梯度20℃25℃30℃下以Banta培养液、小球藻和酵母等三种食物培养老年低额以探究食物与温度对老年低额种群增长的影响。结果表明以小球藻为食物时老年低额在20℃时的净生殖率R0ind.和内禀增长率rmd-1分别为188.41和0.394,25℃为156.08和0.5,30℃为93.12和0.58以Banta培养液为食物时则分别为265.19和0.401153.39和0.43699.8和0.541,以酵母为食物时则分别为65.01和0.33524.73和0.47210.56和0.311。其中内禀增长率以30℃时小球藻组最大,净生殖率以20℃时Banta培养液组最大。

The effects of food and temperature on the population dynamics of Simocephalus vetuls were studied at three temperatures of 20 ℃,25 ℃,30 ℃,fed on Banta liquid culture medium,Chlorella and yeast.The results showed that fed on Chlorella,the intrinsic rate of increase and net productive rate were 188.41and 0.394 at 20 ℃,156.08 and 0.5 at 25 ℃,93.12 and 0.58 at 30 ℃,and fed on Banta liquid medium 265.19 and 0.401 at 20 ℃,153.39 and 0.436 at 25 ℃,99.8 and 0.541at 30 ℃,and fed on yeast 65.0 and 0.335 at 20 ℃,24.73 and 0.472 at 25 ℃,10.56 and 0.311 at 30 ℃.Among them, the highest intrinsic rate of increase of Simocephalus vetuls was got at 30 ℃ fed on Chlorella and the highest net productive rate was at 20 ℃ cultured in Banta liquid culture medium.